r/2-9=15

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Solution for r/2-9=15 equation: 


r in (-oo:+oo)

r/2-9 = 15 // - 15

r/2-15-9 = 0

1/2*r-24 = 0 // + 24

1/2*r = 24 // : 1/2

r = 24/1/2

r = 48

r = 48

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